Some people have found certain MSI based installers are crashing / not working at all in Windows 7. I experienced this while trying to install TortoiseSVN.

If this occurs to you, go to Start > type 'regedit' in the 'Search programs and files' section.

Navigate your way to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SQMClient\Windows\

Right click the 'DeletedSessions' folder and delete it and all its subkeys. Your installer should now work.